[Huan]

For me if you want to get technical , the thing to do would be to fit a small white LED into the muzzle of a gun and have a waterproof switch on the handle.
THis would allow you to illuminate whatever you wanted to see under overhangs/caves etc . it would also be a lot easier than a laser sight to make -no zeroing.
also the applications would interest IMHO a lot more people than laser sights.
I can shoot accurately up to the end of my shooting line with 1 or 2 wraps thats all the accuracy I need.
What I find a pain is to hold a torch and a speargun.